diff --git a/include/asm-um/dma.h b/include/asm-um/dma.h
new file mode 100644
index 0000000..9f6139a
--- /dev/null
+++ b/include/asm-um/dma.h
@@ -0,0 +1,10 @@
+#ifndef __UM_DMA_H
+#define __UM_DMA_H
+
+#include "asm/io.h"
+
+extern unsigned long uml_physmem;
+
+#define MAX_DMA_ADDRESS (uml_physmem)
+
+#endif